一批稀土及硼酸盐新矿物及其晶体结构研究

Changningite is studied by the chemical analysis and crystal structure determination. The space group of changningite is Fd-3 and have 6Cl、6(OH) and 28(BO3) in the cell structure . The results shown that changningite is a new mineral, belonging to the carbonate-borate mineral with island structure character in borate mineral group. The changningite is different from its analogous sakhaite on the space group and chemical composition. . Plumbobetafite is first discovered with crystallization status in the nature and its crystal structure is also first determined with space group Fd3m and structure factor R=0.0404,and Pb occupies 0.73 in structure sites (＞ 0.5). The studies of plumbobetafite provide a new data and knowledges for understanding crystallochemistry and crystal structure of plumbobetafite .Mianningite is a light rare-earth phosphate-silicate mineral of apatite-type structure , belonging to the F-rich analogue of britholite. The relationships of britholite and mianningite is the same to compared with that of hydroxyapatite-fluorapatite. The (OH) sites in britholite replaced by F sites in mianningite. Because Ca、PO4 and (OH) sites in apatite type mineral is replaced by RE、SiO4 and F sites in mianningite,respectively,and to lead to the difference of chemical composition and crystal system or optical axis properties in the rare-earth apatite type minerals, so this substitution is a main cause to make easily new mineral species in the nature. .

利用现代测试技术方法，深入研究四川等地稀土和硼酸盐新矿物的晶体化学及矿物学特征，建立定义矿物新种的科学依据；采用单晶X射线结构解析的空间向量法和直接法、透射电镜峋凼ǎ舛ㄐ驴笪锞附峁梗鼍逯性优帕蟹绞郊肮媛桑胍阎喙乜笪锝欣啾取Ｎ笪镅П庠鎏砜笪镄鲁稍焙托伦柿希欣岣呶夜谛驴笪镅芯苛煊虻墓实匚弧